20001212210 has 64 divisors (see below), whose sum is σ = 42205363200. Its totient is φ = 6681673152.

The previous prime is 20001212191. The next prime is 20001212221. The reversal of 20001212210 is 1221210002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20001212191 and 20001212200.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1253261 + ... + 1269119.

It is an arithmetic number, because the mean of its divisors is an integer number (659458800).

Almost surely, 2^20001212210 is an apocalyptic number.

20001212210 is an abundant number, since it is smaller than the sum of its proper divisors (22204150990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20001212210 is a wasteful number, since it uses less digits than its factorization.

20001212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16335.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001212210 its reverse (1221210002), we get a palindrome (21222422212).

The spelling of 20001212210 in words is "twenty billion, one million, two hundred twelve thousand, two hundred ten".